Lamp for projecting apparatus



N. POWER.

LAMP FOR PROJECTING APPARATUS.

APPLICATION FILED JAN. 10, I917.

Patented May 10, 1921.

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LAMP FOR PROJ'ECTING PARATU$.-

To all whom it may concern:

Be it lrnownthat I, NIoHoLAs POWER, a citizen of the United States, and a resident of Brooklyn, county of Kings, State of New York, have invented new and useful Improvements in Lamps for Projecting Apparatus, of which the following is a specification. T i

This invention relates to improvements in lamp supports of the character particularly adapted for use with motion picture or other projecting apparatus. The object of the invention is to provide a lampsupport, preferably a support for an arc lamp, such as is designed to be inclosed in a lamp-house or similar covering, in which the entire lamp structure may be brought to an accessible position for inspection, adjustment, etc., without disturbing the adjustment of the lamp with regard to the optical axis and focus .oi' the condensers of the projecting mechanism. Y

- A further object of the invention is to provide a device of this character which may be read'ly applied to lamp structures now in use ithout involving a modification of the parts of the present lampstructure beyond the skill of the ordinary mechanic or repair man.

A further object of the invention is to provide a device of this character inwhich the lamp as a whole may be easily shifted from projecting position to the desired position for inspection etc, and vice versa in tachment may be adapted to other styles; of lamps and lamp-houses and otherwise modified without departing from the spiritand scope of'my invention as defined in the appended claims;

ln'the said drawings;

Figure 1 is a longitudinal sectional view of thewell known type of lamp-house show ing the lamp in, projected position and with my improved attachment applied for per-' mitting its ready adjustment to a more convenient and accessible position.

' Fig. 2 is a plan. view of the lamp base a moments "time, to thereby avoid prolonged Specification of Letters Patent. lPaflbq-gmt qgd 1W jlzfl) 11921 Application filed January 10, 1917. Serial No. 14.1,?22.

section on Referring now to the drawings, 1 indicates. apart of the projecting machineupon whlch is supported the base 2 of the lamphouse which incloses the projecting lamp. Supported in suitable lugs projecting upwar ly from the base of the lamp-house is a pa r of longitudinally extending rods 3 constitutmg tracks upon which the base 4: of the lamp is mounted for movement toward and from the condensers 5 of the lamphouse. j 7

As shown, the-"lamp comprises the usual post 6 projecting upwardly from the base 4 and supporting the upper and lower brackets WhlCh carry the carbons 7 of the lamp, the carbons extending in inclined position so that the direction of greatest illumination from the crater of the arc is toward the condensers 5.

The above described mechanism comprises the essential parts of a projecting arc as now in use, the rods 3 being'long enough to permit the active ends of the carbons to be adjusted toward and from the condensers to an extent suflicient to secure the proper focus of the light under: all practical conditions.

' In use, the location of the illuminating ends.

of the carbon is quite near the rear wall of the condenser so that the major portion of the lamp cannot be readily reached through the doors forming the side walls of the lamphouse, one of which doors is indicated at 8 in Fig. 1. It not infrequently happens that slight adjustment of the members holding the carbons and other parts not provlded with adjusting devices for actuationdrom without the lamp-house, requiremanipulation in order to secure the proper operation of the lamp, and it has heretofore been necessary to shut 0d the lamp and completely remove the superstructure of the lamp-house or else work at great inconvenience in making the necessary jrepairs and adjustments. In carrying. out my invention to overcome this dificulty; I extend the rods 3 forming the lamp-supporting tracks substantially to the rear wall of the lamp-house, and provide for efiecting the adjustment of the base along the rods, a screw shaft 10 having its end threaded through a lug in the rear wall of the base 4, as indicated at 11, the unthreaded portion of the shaft adjacent the handle working through a lug 12 on the base 2 of the lamp-house outside the rear wall.

The lug 12 is slotted to receive a latch 15 pivoted on the rear wall of the lamp-house and provided with a projecting handle by which it may be readily shifted to withdraw its end from the groove 14 formed in the threaded shaft 10 adjacent its knob. A spring 16 is mounted as shown" to normally hold the latch in engagement with the groove.

In operation theadjustment of thelamp to the proper position with regard to the focus of the condensers is effected by rotating the screw shaft while held locked against longitudinal movement by means of the latch 15. Should it become necessary in the course of the exhibition to adjust some part of the lamp which is not accessible through the door 8 of the lamp-house, the operator has merely to depress the handle of the latch and draw the entire lamp back on the track rods 3 until the part to be removed or to be repaired or adjusted is opposite the door opening. After the repair or adjustment is completed, the lamp is pushed toward the condensers by means of the screw shaft and without rotating the latter, until the latch again snaps into the groove 14 of the screw shaft. This will return the lamp to the exact position which it occupied before and the exhibition may be resumed with 'a minimum loss of time.

In the greater number of lamp-projecting apparatus now on the market the adjustment of the lamp with regard to the focusing condensers is effected by means of a screw shaft similar to the screw shaft 10 threaded in the base of the lamp in a manner similar to the arrangement shown in the drawing working through an car on the base of the lamp house. In applying my improvement to such constructions it is only necessary to slot the ear and cut the groove 14 in the end of the shaft 10 to receive the end of the latch 15, and pivot the latch in place upon the rear wall of the lamp-house. 'Thisipart may be added by merely tapping a small threaded hole in the base of the lamp-house to receivethe pivoted screw of the latch. In the above description and accompanymg drawings, I have disclosed an embodiment of my invention which is preferred because of its ready adaptation to the present design of lamp-house, but it will of course be understood that various other means may be employed for locking the shaft in operative position, and that various other changes may be made in the construction within the scope of my invention.

I claim:

1, In a lighting equipment for projecting mechanism embodying a part normally held against bodily movement, and means for re- I leasing said part. whereby the lam and screw mechanism may be slidably shi ted as a unit to permit the rapid extensive adjustment of said lamp.-

2. In a lighting equipment for projecting apparatus, the combination of a lamp support, a screw for adjusting the lamp support to focus the light, said screw being mounted for both rotary and longitudinal movement relative to said lamp support, a bearing for said screw stationary relative to the frame of the. projecting apparatus and normally maintaining said screw in fixed longitudinal relation thereto, and means for releasing said screw for longitudinal movement relative to said bearing.

3. In a lighting equipment for projecting apparatus, the combination of a lamp-support, a screw for adjusting the lamp-support to focus the light, said screw being mounted. for both rotative and longitudinal movement relative to the movement of the-projecting apparatus, and a latch for normally holding the screw against longitudinal movement relative thereto to render its rotative mo'vement effective for shifting the lamp, the

lamp and screw being longitudinally movable as a unit for quick adjustment when said latch is released. I

4. In a lighting equipment for projecting apparatus, the combination of a lampsupport, a screw for adjusting the lampsupport to focus the light, said screw being mounted for both rotative and longitudinal movement, a bearing for said screw on the base of the lamp-housing, a latch working in said bearing, and a groove in said screw adapted to be engaged by said latch to hold the screw against longitudinal movement in fixed position with relation to said bearin 5. In a lighting equipment for projecting apparatus, the combination of a lamp, a housing therefor, a screw mechanism for effecting minute adjustment of the lamp within said housing comprising a screw normally held stationary relative to the frame of the projecting apparatus, and means for releasing the screw and permitting it extensive longitudinal movement and subsequently permitting its return to the exact position occupied previous to said extensive movement.

Signed at New York city, in the county of New York and State of New York, this 30th day of Dec., 1916. I

NICHOLAS POWER oi. Me -t1.

It is hereby certified thet in LetterePetent, No, 11 377,728, grenteti Mey 10,

1921, upon the application of Nicholee Power, of Brooklyn, New York, for en improvement in Lamps for Projectirig Apperetue, on error appears in the printed specification requiring correction es follows: Pege 2, hues 93, cleim .3,

for the word movement reed frame; and thet the seid Letters Patent should he reed with this correction therein that the eeme may conform to the record of the cese in the Patent Ufice.

Signed and seeled this ltth diey of June, A; 11)., 1921.

[ -1 WM A. meme;

Aetiwg Uommieeiener of Pairwise, 

